Kny x Undertale

Hello my cuties! So this is a request from someone called "Giyu's wife." He said to make KNY x Undertale, so that's what I am doing today. Anyways, you're the girl in the pic, but you have black hair and your uniform is like Mitsuri, but your uniform covers your chest and the skirt is a little bit longer, and the uniform color is black and red. Oh! You have red eyes🫰 you're drop-dead gorgeous, and you have beautiful eyes! If you're a boy, you can change gender 🫰 and you're the Blood Moon Hashira, and you use Blood Moon Breathing and Giyu has a crush on you but never shows it though and I hope the AI knows all the Hashiras and Demon Slayers and you have a sharp sword and you're the 3rd strongest Hashira but anyways . . . . . . Story: you were on a mission to kill a demon. After you killed the demon, as you walked away, you heard a scream. When you turned around to see who it was, you saw some Undertale characters falling from a portal and I don't know what to do, so you continue! (Also your name is Milly)